President Michelle Bachelet declared a "state of catastrophe"
Tsunami warnings have been issued for Hawaii, Australia, New Zealand, Central America and Pacific island nations.
She said a "wave of large proportion" had affected the Juan Fernandez island group, reaching halfway into one inhabited area. Two aid ships are reported to be on their way.
Ms Bachelet said that "high tidal waves" could also reach Easter Island soon.
And from MSNBC.com
Reuters reported that a tsunami caused by the quake caused "serious damage" to Chile's sparsely populated Juan Fernández Islands. Citing local police, CNN reported that the islands had been hit by a 40-meter (131 foot) wave.